Effects of reduced plant height on breeding requirements and ...

showed no response to N, while C?AZOZ4 anð. Minn 64_62
showed earlier maturity in response to ttre first N increrner:t
but delayed rnaturity at highrer N levels. 0n the o.bher hando
C?O3OI.L â.^d C?O3O3Z showed only a delay in maturity as N
increased "
Ða¡¿s in Pos!--A.ntÌre s-Ls. No data were calculated for thÍs
characteristic at Carnøn 79?6, N affected this pararne ter
only at Carman I)lJ and Sanford l_926 (Table 39). At both
sítes, the lower increments <strong>of</strong> N lengthened the pcst_
anthesis period, prinarily via delayed rnaturity (fa¡te 3?);
howevern the effect <strong>of</strong> earl_ier heading at higher N levels
at Carman t9Z5 (lable ll) was also j-nvolved "
At both 1925 sites the tall genotypes had longer post_
anthesis periods than the semi-dwarfs, while i:n I)16 there
ìirere no sígnificant dífferences at sanford and a cifferenee
in favour <strong>of</strong> the semi-dwarfs at portage (table O0B).
In general CZo3O]I a:nd C?O3O3Z had the shortest post_
anthesis periods and Minn 64-62 tøa the longest (fable 4oe¡,
reflecting their differences in maturity. At portage, a9?6,
although not demonstrated by the Duncanrs Multiple Range
test (Table 4OA), the single degree <strong>of</strong> fr.eeriom comparison
(rable 39) indicated thåt \Iinn 64-62 had a signÍficantly
longer post-anthesis period than Bonanza.
the F x G interaetion at Car¡na ^ Lg?s was due t,o Õ?OZAZ4
showing no significant response to nitrogen, while the other
genotypes did (fable ¿llB), Differences between genotype s
LT4